D4 Review

Which of these is NOT an example of a physical change?

• crumpling up a piece of paper

• ice-cream melting

• chopping up carrots

• a reaction of baking soda and vinegar

A change of state is a physical change.

• True

• False

Why do particles move slower in solids than in gases?

• Because solid particles are heavier.

• Because solid particles are lazy.

• Because gas particles have more energy.

• Because gas particles are smaller.

What has to happen for a solid to change to a liquid.

• Add energy

• Lose energy

• Keep the energy the same

• Make it colder

What happens to a liquid if enough energy is removed?

• It will condense

• It will freeze

• It will boil

• It will sublimate

The ice in the picture is ______________ (changing from a solid to a liquid).

Why do scientists wear heavy protection when they work with liquid oxygen?

• It is extremely hot.

• It might attack them.

• It is extremely cold.

• It is dangerous to look at.

The dry ice in the picture is changing from a solid to a gas. This is called ...

• vaporization

• freezing

• melting

• sublimation

When a gas changes to a liquid, the density ...

• increases

• decreases

• stays the same

When a gas changes to a liquid, the volume ...

• increases

• decreases

• stays the same